Just hours after taking the Oath of Office, Mr Trump signs an executive order that directs government departments to scale back as many aspects of the Affordable Care Act as possible - a symbolic first act in his quest to dismantle Obamacare.
23 January 2016
Action on abortion
Mr Trump reinstates a ban on providing federal money to international groups that perform abortions or provide information on the option (Obama ended the ban in 2009). Trump signs the order surrounded by key aides - all of whom are men.
23 January 2017
Federal hiring freeze
Trump signs an executive order imposing a federal hiring freeze, with exceptions only for military, national security or public safety personnel.
23 January 2017
In a move that distances America from its Asian allies, Mr Trump withdraws the US from the Trans-Pacific Partnership (TPP) trade deal. The president says it is a "great thing for the American worker".
24 January 2017
Dakota pipeline green light
Mr Trump signs an executive order to push ahead with the controversial Keystone and Dakota oil pipelines. They had been halted under President Obama after years of opposition and protests.
25 January 2017
US-Mexico border wall
Mr Trump promises "immediate construction" will begin on the US-Mexico border wall and repeats that he will ensure Mexico itself pays for it.
28 January 2017
Immigrant travel ban
Trump signs an executive order banning people from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen from travelling to the US. Protests take place throughout America in the wake of the ban.
30 January 2017
Sacks Sally Yates
Donald Trump fires acting Attorney General Sally Yates after she ordered Justice Department lawyers to stop defending the president's controversial immigration orders.
3 February 2017
Dodd-Frank executive order
Trump signs an executive order to review the 2,300-page Dodd-Frank Act (brought into law by Barack Obama in 2010) as part of a drive to slash restrictive regulations on businesses. The move sends shares in financial firms surging.